HWH fluid is everywhere--how much can we lose?

You might have to call the factory to get the location of the reservoir - on our rig, it's right up front, just behind the front "bumper". I've seen some rigs where you get at it through one of the wheel wells.

Don't even try to open it until you get the jacks retracted - until the jacks are up, the whole HWH system is pressurized. On our rig, the system isn't pressurized when the slide is out, but I wouldn't risk it until the all the slides are back in.

Good luck.

al